drivers/staging/lustre/lustre/obdclass/linux/linux-obdo.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/obdclass/linux/linux-obdo.c
  37  *
  38  * Object Devices Class Driver
  39  * These are the only exported functions, they provide some generic
  40  * infrastructure for managing object devices
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_CLASS
  44
  45 #include <linux/module.h>
  46 #include "../../include/obd_class.h"
  47 #include "../../include/lustre/lustre_idl.h"
  48
  49 #include <linux/fs.h>
  50 #include <linux/pagemap.h> /* for PAGE_CACHE_SIZE */
  51
  52 /*FIXME: Just copy from obdo_from_inode*/
  53 void obdo_from_la(struct obdo *dst, struct lu_attr *la, __u64 valid)
  54 {
  55         obd_flag newvalid = 0;
  56
  57         if (valid & LA_ATIME) {
  58                 dst->o_atime = la->la_atime;
  59                 newvalid |= OBD_MD_FLATIME;
  60         }
  61         if (valid & LA_MTIME) {
  62                 dst->o_mtime = la->la_mtime;
  63                 newvalid |= OBD_MD_FLMTIME;
  64         }
  65         if (valid & LA_CTIME) {
  66                 dst->o_ctime = la->la_ctime;
  67                 newvalid |= OBD_MD_FLCTIME;
  68         }
  69         if (valid & LA_SIZE) {
  70                 dst->o_size = la->la_size;
  71                 newvalid |= OBD_MD_FLSIZE;
  72         }
  73         if (valid & LA_BLOCKS) {  /* allocation of space (x512 bytes) */
  74                 dst->o_blocks = la->la_blocks;
  75                 newvalid |= OBD_MD_FLBLOCKS;
  76         }
  77         if (valid & LA_TYPE) {
  78                 dst->o_mode = (dst->o_mode & S_IALLUGO) |
  79                               (la->la_mode & S_IFMT);
  80                 newvalid |= OBD_MD_FLTYPE;
  81         }
  82         if (valid & LA_MODE) {
  83                 dst->o_mode = (dst->o_mode & S_IFMT) |
  84                               (la->la_mode & S_IALLUGO);
  85                 newvalid |= OBD_MD_FLMODE;
  86         }
  87         if (valid & LA_UID) {
  88                 dst->o_uid = la->la_uid;
  89                 newvalid |= OBD_MD_FLUID;
  90         }
  91         if (valid & LA_GID) {
  92                 dst->o_gid = la->la_gid;
  93                 newvalid |= OBD_MD_FLGID;
  94         }
  95         dst->o_valid |= newvalid;
  96 }
  97 EXPORT_SYMBOL(obdo_from_la);
  98
  99 /*FIXME: Just copy from obdo_from_inode*/
 100 void la_from_obdo(struct lu_attr *dst, struct obdo *obdo, obd_flag valid)
 101 {
 102         __u64 newvalid = 0;
 103
 104         valid &= obdo->o_valid;
 105
 106         if (valid & OBD_MD_FLATIME) {
 107                 dst->la_atime = obdo->o_atime;
 108                 newvalid |= LA_ATIME;
 109         }
 110         if (valid & OBD_MD_FLMTIME) {
 111                 dst->la_mtime = obdo->o_mtime;
 112                 newvalid |= LA_MTIME;
 113         }
 114         if (valid & OBD_MD_FLCTIME) {
 115                 dst->la_ctime = obdo->o_ctime;
 116                 newvalid |= LA_CTIME;
 117         }
 118         if (valid & OBD_MD_FLSIZE) {
 119                 dst->la_size = obdo->o_size;
 120                 newvalid |= LA_SIZE;
 121         }
 122         if (valid & OBD_MD_FLBLOCKS) {
 123                 dst->la_blocks = obdo->o_blocks;
 124                 newvalid |= LA_BLOCKS;
 125         }
 126         if (valid & OBD_MD_FLTYPE) {
 127                 dst->la_mode = (dst->la_mode & S_IALLUGO) |
 128                                (obdo->o_mode & S_IFMT);
 129                 newvalid |= LA_TYPE;
 130         }
 131         if (valid & OBD_MD_FLMODE) {
 132                 dst->la_mode = (dst->la_mode & S_IFMT) |
 133                                (obdo->o_mode & S_IALLUGO);
 134                 newvalid |= LA_MODE;
 135         }
 136         if (valid & OBD_MD_FLUID) {
 137                 dst->la_uid = obdo->o_uid;
 138                 newvalid |= LA_UID;
 139         }
 140         if (valid & OBD_MD_FLGID) {
 141                 dst->la_gid = obdo->o_gid;
 142                 newvalid |= LA_GID;
 143         }
 144         dst->la_valid = newvalid;
 145 }
 146 EXPORT_SYMBOL(la_from_obdo);
 147
 148 void obdo_refresh_inode(struct inode *dst, struct obdo *src, obd_flag valid)
 149 {
 150         valid &= src->o_valid;
 151
 152         if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
 153                 CDEBUG(D_INODE,
 154                        "valid %#llx, cur time %lu/%lu, new %llu/%llu\n",
 155                        src->o_valid, LTIME_S(dst->i_mtime),
 156                        LTIME_S(dst->i_ctime), src->o_mtime, src->o_ctime);
 157
 158         if (valid & OBD_MD_FLATIME && src->o_atime > LTIME_S(dst->i_atime))
 159                 LTIME_S(dst->i_atime) = src->o_atime;
 160         if (valid & OBD_MD_FLMTIME && src->o_mtime > LTIME_S(dst->i_mtime))
 161                 LTIME_S(dst->i_mtime) = src->o_mtime;
 162         if (valid & OBD_MD_FLCTIME && src->o_ctime > LTIME_S(dst->i_ctime))
 163                 LTIME_S(dst->i_ctime) = src->o_ctime;
 164         if (valid & OBD_MD_FLSIZE)
 165                 i_size_write(dst, src->o_size);
 166         /* optimum IO size */
 167         if (valid & OBD_MD_FLBLKSZ && src->o_blksize > (1 << dst->i_blkbits))
 168                 dst->i_blkbits = ffs(src->o_blksize) - 1;
 169
 170         if (dst->i_blkbits < PAGE_CACHE_SHIFT)
 171                 dst->i_blkbits = PAGE_CACHE_SHIFT;
 172
 173         /* allocation of space */
 174         if (valid & OBD_MD_FLBLOCKS && src->o_blocks > dst->i_blocks)
 175                 /*
 176                  * XXX shouldn't overflow be checked here like in
 177                  * obdo_to_inode().
 178                  */
 179                 dst->i_blocks = src->o_blocks;
 180 }
 181 EXPORT_SYMBOL(obdo_refresh_inode);
 182
 183 void obdo_to_inode(struct inode *dst, struct obdo *src, obd_flag valid)
 184 {
 185         valid &= src->o_valid;
 186
 187         LASSERTF(!(valid & (OBD_MD_FLTYPE | OBD_MD_FLGENER | OBD_MD_FLFID |
 188                             OBD_MD_FLID | OBD_MD_FLGROUP)),
 189                  "object "DOSTID", valid %x\n", POSTID(&src->o_oi), valid);
 190
 191         if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
 192                 CDEBUG(D_INODE,
 193                        "valid %#llx, cur time %lu/%lu, new %llu/%llu\n",
 194                        src->o_valid, LTIME_S(dst->i_mtime),
 195                        LTIME_S(dst->i_ctime), src->o_mtime, src->o_ctime);
 196
 197         if (valid & OBD_MD_FLATIME)
 198                 LTIME_S(dst->i_atime) = src->o_atime;
 199         if (valid & OBD_MD_FLMTIME)
 200                 LTIME_S(dst->i_mtime) = src->o_mtime;
 201         if (valid & OBD_MD_FLCTIME && src->o_ctime > LTIME_S(dst->i_ctime))
 202                 LTIME_S(dst->i_ctime) = src->o_ctime;
 203         if (valid & OBD_MD_FLSIZE)
 204                 i_size_write(dst, src->o_size);
 205         if (valid & OBD_MD_FLBLOCKS) { /* allocation of space */
 206                 dst->i_blocks = src->o_blocks;
 207                 if (dst->i_blocks < src->o_blocks) /* overflow */
 208                         dst->i_blocks = -1;
 209
 210         }
 211         if (valid & OBD_MD_FLBLKSZ)
 212                 dst->i_blkbits = ffs(src->o_blksize)-1;
 213         if (valid & OBD_MD_FLMODE)
 214                 dst->i_mode = (dst->i_mode & S_IFMT) | (src->o_mode & ~S_IFMT);
 215         if (valid & OBD_MD_FLUID)
 216                 dst->i_uid = make_kuid(&init_user_ns, src->o_uid);
 217         if (valid & OBD_MD_FLGID)
 218                 dst->i_gid = make_kgid(&init_user_ns, src->o_gid);
 219         if (valid & OBD_MD_FLFLAGS)
 220                 dst->i_flags = src->o_flags;
 221 }
 222 EXPORT_SYMBOL(obdo_to_inode);